C. European city, in retrospect, used to be chilly (6)

I believe the answer is:

warsaw

I'm a little stuck... Click here to teach me more about this clue!

'c european city' is the definition.
'Warsaw' can be an answer for 'city' (Warsaw is an example). I'm unsure of the 'c european' bit.

'in retrospect used to be chilly' is the wordplay.
'in retrospect' says the letters should be written backwards.
'used to be' becomes 'was' (eg 'he was...' means 'he used to be...').
'chilly' becomes 'raw' (I've seen this in another clue).
'was'+'raw'='wasraw'
'wasraw' backwards is 'WARSAW'.

Can you help me to learn more?

(Other definitions for warsaw that I've seen before include "European city (with a Convention for commercial flying)" , "Polands capital" , "Largest city in Poland" , "Capital city on the Vistula" , "Polish capital" .)

I've seen this clue in The Everyman puzzle in The Observer.

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